A new species of Tanna Distant, 1905 from Yunnan, China (Hemiptera, Cicadidae, Cicadinae)

Abstract Background The genus Tanna Distant, 1905 (Hemiptera, Cicadidae, Cicadinae, Leptopsaltriini, Leptopsaltriina) currently includes 23 species (three tentatively placed), with its actual geographical distribution in China, Japan, Nepal, Bhutan, Cambodia, Thailand and Vietnam. Most of them, 16 species, are known from China, including one new species here described. New information A new species of cicada, Tannafengi Wang sp. nov., is described from Yunnan, southwest China. Colour plates are presented to illustrate all diagnostic characters. An updated list of Tanna species occurring in China is provided.

The present study on Tanna material from Yunnan Province of China (representing a new provincial record for the genus) yielded one new species to science, where all diagnostic characters are broadly illustrated.Nowadays, 16 species of the genus Tanna are known from China, including T. fengi Wang sp.nov.here described below.

Species list of Tanna Distant, 1905 from China
(Alphabetically listed and modified from Sanborn (2013) and Lee and Emery (2020)).

Materials and methods
Fieldwork recovered six males and eight females of the new species from Yunnan of China in July 2022 and were kept in cold fluid (-20℃).Specimens were relaxed and softened in water at room temperature for 24 hours and then placed in distilled water for cleaning and dissection.To examine the male genitalia, the pygofer together with sternite VIII were detached and treated with a 10% potassium hydroxide (KOH) solution at room temperature for 12 hours.They were then placed in distilled water to remove any remaining KOH and prevent further bleaching.After examination, the body parts were mounted on a slide using Euparal Mounting Medium for future studies.Images were taken with a Canon macro photo lens MP-E 65 mm on a Canon 5DsR.Images of the same object at different focal planes were combined using Zerene Stacker 1.04 stacking software.Adobe Photoshop CS6 was used for image post-processing.Description was based on dry specimens.Morphological terminology follows Moulds (2005) and Moulds (2012) and higher taxonomy follows Marshall et al. (2018) and Simon et al. (2019).Measurement criteria in millimetres (mm) follow Wang and Liu (2022).
Type material is deposited in the following institutional and private collections: MYNU Invertebrate collection of Mianyang Normal University, Mianyang, China; cLFW private collection of Lei Feng, Weifang, China.

Taxon treatment
Tanna fengi Wang sp.nov.Head with bottom colour fuscous, with following blackish markings occupying most of head: median fascia enclosing three ocelli, not reaching frontoclypeal suture anteriorly and confluent with posterior fascia posteriorly, with anterior part inverted subtriangular, diverging into two slender stripes at each lateral angle, of which anterior one extending on to and occupying most of supra-antennal plate and posterior one extending longitudinally to lateral ocellus; lateral fasciae rather large, between median fascia and eyes; posterior fascia narrow, along entire posterior margin of head.Compound eyes greyish, protruding.Ocelli brownish.Distance between lateral ocellus and corresponding eye about 2.2 times as wide as distance between lateral ocelli.Antennae fuscous to blackish.Postclypeus distinctly swollen; mostly blackish, with a brownish longitudinal fascia at middle of basal part and brownish between transverse grooves.Anteclypeus mostly blackish, vaguely tinged fuscous near centre and with a brownish spot at base.Genae brownish.Lorum almost entirely blackish.Rostrum brownish, except blackish at apex, reaching posterior margin of abdominal sternite I.
Thorax.Pronotum fuscous at pronotal disc while brownish at pronotal collar, without markings along paramedian and lateral fissures, but with following blackish markings (except brownish median fascia): median fascia slender, roundly dilated at posterior end, far away from anterior margin of pronotum and posteriorly approaching ambient fissure; submedian fasciae long, enclosing median fascia, strongly broadened at both anterior and posterior ends; marginal fasciae relatively wide, along lateral margins of pronotal collar and confluent with front corner spots; front and back corner spots situated before and after hind corners of pronotal collar, respectively; posterior fascia very narrow, along middle part of posterior margin of pronotal collar.Pronotal collar short, ampliate posterolaterally, with lateral margins sinuate, but not dentate; hind corners widely rounded; surface transversely grooved.Mesonotum fuscous, with following blackish markings: median fascia long, relatively slender, somewhat widened posteriorly, reaching anterior margin of cruciform elevation, with posterior part extending laterally to enclose scutal depressions and then curved anteriorly with triangular apices; paramedian fasciae rather wide, occupying most of submedian sigillae, medially curved to join median fascia; accessory fasciae short, slender, between paramedian and lateral fasciae, confluent with lateral fasciae posteriorly; lateral fasciae wide, along medial margins of lateral sigillae, with posterior ends bent laterally and confluent with marginal fasciae; marginal fasciae wide, along lateral margins of mesonotum.Cruciform elevation brown, fuscous to blackish in apical parts of anterior arms.Wing grooves brown.Thoracic sternites brownish, except blackish at katepisterna II.
Wings hyaline.Venation generally fuscous to brownish, more or less lighter apically; R+Sc veins blackish-brown basally.Forewing with 8 apical cells; ulnar cell 3 about 3.0 times as long as apical cell 5; RA vein with longitudinal portion about 1.7 times as long as basal portion; infuscations distinctly present on r, r-m and m crossveins, slightly on m-cu crossvein and rather inconspicuously on apices of longitudinal veins of apical cells (cannot be seen in photos); nodal line absent; basal cell slightly infuscated; basal membrane brownish.Hindwing with 6 apical cells; jugum and longitudinal margins of vannus brownish.
Abdomen cylindrical, fuscous on dorsum and brownish on venter, with posterior margin of each tergite narrowly blackish, without distinct white pollinosity.Timbal cover scalelike, mostly brown and tinged blackish at medial base, concealing timbal in dorsal view.Operculum mostly brownish, widely blackish along outer margin; scale-like, longer than wide, with medial margin barely emarginate in basal half; apex rounded, extending beyond posterior margin of abdominal sternite II; widely separated from each other with gap as wide as one of them.Abdominal tergites I-III much wider than mesonotum, tergite III 1.6 times as wide as mesonotum.Abdominal sternite III with paired fuscous tubercles near posterolateral corners, protruding posterolaterally; sternite IV with smaller paired brown tubercles around middle of lateral margins, protruding posterolaterally; sternite VII wider than long, gently emarginate in middle of posterior margin; sternite VIII (Fig. 2A-C) oblong, constricting in posterior part, with posterior margin nearly truncate; surface gently convex ventrally; anterolateral apodemes almost absent.
Male genitalia.Pygofer 5.0 mm long and 2.8 mm wide, elliptical in ventral and dorsal views (Fig. 2D, G); anal styles relatively small, less sclerotised, densely covered with short setae apically (Fig. 2F); dorsal beak lightly sclerotised, widely subtriangular in dorsal view (Fig. 2G); basal lobes short, dentiform in ventral view (Fig. 2D) and tuberculate in ventrolateral view (Fig. 2E), abutting to upper lobes; upper lobes longer than basal lobes, digitiform, abutting to side of pygofer (Fig. 2D-F); distal shoulders round in ventral view (Fig. 2D) and obliquely truncate in lateral view (Fig. 2F).Uncus simple, not bifurcate, slender in apical part and gently bent inwards in lateral view (Fig. 2F); apex widely truncate, but emarginate medially (Fig. 2H).Aedeagus thick, slightly narrower than apical part of uncus (Fig. 2I), with apical third strongly curved ventrally in lateral view (Fig. 2J); dorsal surface of apex with an inverted long triangular membranous area (Fig. 2K).Rostrum almost reaching middle level of abdominal sternite IV; forewing much more slender, length-width ratio 3.2 compared with 2.7 in male; abdomen considerably short, gradually narrowed in about apical half; operculum small, almost as long as wide, reaching posterior margin of abdominal sternite II; abdominal tergite III 1.4 times as wide as mesonotum; abdominal sternite VII (Fig. 3B) subtriangularly incised at middle of posterior margin and slightly protruded beside incision; ovipositor sheath blackish, not extending beyond dorsal beak; dorsal beak small, sharp, as long as anal styles.

Diagnosis
Lee and Emery (2020) (p.112) stated that: "This species [T.crassa] is similar to T. abdominalis (Kato, 1938) as both species...have very wide male abdomens that are much wider than their heads and mesonota, which are not in any other true Tanna species.";likewise, Tanna fengi Wang sp.nov.has a considerably wide male abdomen, which is 1.6 times as wide as mesonotum and 1.5 times as wide as head.
The new species is easily distinguished from the above two closely-related species by the combination of the following characters (base on males): body length < 37.0 mm (body length also < 37.0 mm in T. crassa, but > 42.0 mm in T. abdominalis); head with blackish markings occupying most of head (head green to greenish-ochraceous or brown with normal blackish markings in both T. abdominalis and T. crassa); rostrum relatively longer, reaching posterior margin of abdominal sternite I (rostrum relatively shorter, extending beyond posterior margin of hind coxae in both T. abdominalis and T. crassa); pronotum bicoloured, fuscous at pronotal disc, while brownish at pronotal collar (pronotum bicoloured, brown at pronotal disc, while light green or greenishochraceous at pronotal collar in T. abdominalis; pronotum unicoloured, both brown at pronotal disc and collar in T. crassa); infuscations distinctly present on r, r-m and m crossveins, slightly on m-cu crossvein and rather inconspicuously on apices of longitudinal veins of apical cells (infuscations distinctly present on r, r-m, m and m-cu crossveins, as well as on apices of longitudinal veins of apical cells in both T. abdominalis and T. crassa); abdominal tergite VIII without white pollinosity (abdominal tergite VIII almost entirely covered with white pollinosity in both T. abdominalis and T. crassa); sternite III with paired tubercles and IV with smaller pair (only sternite III with paired tubercles in both T. abdominalis and T. crassa).

Etymology
The new species is dedicated to Mr. Lei Feng (Weifang, China), a Chinese amateur devoted to cicadas, for his help to my taxonomic study on Cicadidae.The name is a noun in the genitive case."冯氏螗蝉" is proposed for the Chinese common name of this new species.